Photo 3837-25: Spiny heads of button snakeroot (Eryngium...of Somerville Lake State Park. Texas


Spiny heads of button snakeroot (Eryngium yuccifolium) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026

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Thumbnail of picture 3837-24: Button snakeroot (Eryngium yuccifolium) both in natural light and ... Somerville Lake State Park. Texas, June 28, 2026

Thumbnail of picture 3837-22: Flower of summer spiderlily (woodland spider-lily, Hymenocallis ... Somerville Lake State Park. Texas, June 28, 2026

Thumbnail of picture 652-11: Spiny button-like flower heads in umbels of button snakeroot ... on Deer Run Trail. College Station, June 15, 2008

Thumbnail of picture 3816-29: Spotted beebalm (Monarda punctata) under both white light and a 365 nm ... Somerville Lake State Park. Texas, April 19, 2026

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Spiny heads of button snakeroot (Eryngium yuccifolium) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026